CN114960623A - Basic structure and construction method of PSLC construction method pile - Google Patents
Basic structure and construction method of PSLC construction method pile Download PDFInfo
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- CN114960623A CN114960623A CN202210758930.8A CN202210758930A CN114960623A CN 114960623 A CN114960623 A CN 114960623A CN 202210758930 A CN202210758930 A CN 202210758930A CN 114960623 A CN114960623 A CN 114960623A
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- 238000010276 construction Methods 0.000 title claims abstract description 92
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 152
- 239000010959 steel Substances 0.000 claims abstract description 152
- 239000002689 soil Substances 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000005452 bending Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000011435 rock Substances 0.000 claims description 30
- 239000004568 cement Substances 0.000 claims description 26
- 238000011084 recovery Methods 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 7
- 238000004080 punching Methods 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/08—Locking forms; Edge joints; Pile crossings; Branch pieces
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
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Abstract
The invention discloses a basic structure and a construction method of a PSLC construction method pile, wherein the basic structure comprises a PS pile, steel pipes, linear steel, lock catches and Larsen steel plate piles, the basic structure takes a PS pile group as a unit and consists of a plurality of groups of PS piles, each group of PS piles comprises one steel pipe, one linear steel, a plurality of Larsen steel plate piles and a plurality of lock catches, when the PS piles are supported by single-row piles, the two lock catches are arranged, and when the PS piles are supported by double-row piles, the three lock catches are arranged; the PS piles are arranged on the soil facing side, steel materials in a straight shape are connected to the inner wall of the steel pipe in the vertical direction, and two lateral limit points of the steel pipe in the horizontal direction are connected with the Larsen steel plate piles through lock catches. The PSLC construction method pile in the basic structure and the construction method of the PSLC construction method pile is additionally provided with a through long straight-shaped steel section on the inner side of a steel pipe to improve the bending rigidity of the steel pipe and ensure the engineering safety of a foundation pit; the method can not only solve the problem of safety of foundation pit engineering, but also ensure the engineering economy, and play an important role in the foundation pit engineering.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a basic structure of a pile in a PSLC construction method and a construction method.
Background
The construction method is that a multi-shaft type drilling and digging stirrer drills and digs at a certain depth on site, cement series reinforcer is sprayed out of a drill bit to be repeatedly mixed and stirred with foundation soil, overlapping construction is adopted among construction units, then a steel plate is inserted as a stress reinforcing material of the cement and soil mixture before the cement and soil mixture is hardened until the cement is hardened, and a seamless underground wall body with certain strength and rigidity is formed.
However, for foundation pits with large excavation depth and poor geological conditions, the conventional fabricated retaining structures, such as steel piles, precast concrete piles, combined cement-soil piles and the like, may have the problem of insufficient bending rigidity, and although conventional drilling and pouring can solve the problem of insufficient bending rigidity, the construction cost is relatively high. The foundation pit engineering is a temporary engineering, the excessive cost is obviously a non-cost matter, and if a novel supporting and retaining structure can be developed, the engineering economy can be ensured on the premise of ensuring the safety of the foundation pit engineering, so that the foundation pit engineering is very important.
Moreover, conventional fabricated retaining structures, such as steel piles, precast concrete piles, combined cement-soil piles and the like, are easy to form piles in filled soil, cohesive soil and silt due to pile forming processes, construction equipment and the like, and are easy to pull out for recycling. However, in rock strata, piles are difficult to form through matching equipment, and other hole guiding equipment is needed for hole guiding. The construction method generally adopted is that a rotary drilling rig or a punching rig is used for pre-drilling holes, the diameter of each formed hole is slightly larger than the diameter of the supporting and blocking structure, and soil in each hole is completely fished out; after the hole is formed, the assembled supporting and blocking structure is placed in the hole; because the pore-forming diameter is greater than a retaining structure diameter, consequently a retaining structure can produce the initial displacement not in the design range downthehole, leads to the deformation of foundation ditch to be greater than the design calculation result, causes the potential safety hazard, consequently needs to pour into grout into in the hole, guarantees that a retaining structure closely laminates with the soil body, eliminates the initial displacement not in the design range. The method can form the pile, but the supporting and blocking structure cannot be pulled out and recycled due to the fact that the supporting and blocking structure is completely wrapped by cement paste, and economic waste is caused.
In addition, the double-row pile can make up the defect that the deformation of a single-row cantilever pile is large and the supporting depth is limited to a certain extent, the proper excavation depth is determined by calculation according to the deformation control requirement, and the double-row pile can be considered when the arrangement of the anchor rods and the inner support is difficult. The tops of front and rear row piles of the double-row piles are connected by a cross beam, and soil between the piles is reinforced when stratum conditions are poor, so that the overall rigidity of the double-row piles is enhanced. The conventional treatment method for strengthening the soil between the piles is a cement soil mixing pile or a high-pressure jet grouting pile, and the treatment method is high in cost.
Disclosure of Invention
The invention aims to provide a basic structure and a construction method of a PSLC construction method pile, which aim to solve the problems that the existing PC construction method pile has relatively insufficient rigidity and possibly unsatisfied bending strength for a foundation pit with larger excavation depth and poorer geological conditions proposed in the background technology; the conventional PC method is difficult to insert the pile into the rock, and even if the conventional PC method is used for construction after hole forming is carried out by pre-hole forming equipment, the conventional PC method also has the problem of difficult recovery.
In order to solve the problems, the invention provides a basic structure of a PSLC construction method pile and a construction method, wherein the basic structure comprises a PS pile, steel pipes, linear steel, lock catches and Larsen steel plate piles, the basic structure takes a PS pile group as a unit and consists of a plurality of groups of PS piles, each group of PS piles comprises one steel pipe, one linear steel, a plurality of Larsen steel plate piles and a plurality of lock catches, when the PS piles are supported by single-row piles, the two lock catches are arranged, and when the PS piles are supported by double-row piles, the three lock catches are arranged; the PS piles are arranged on the soil facing side, steel materials in a straight line shape are connected to the inner wall of the steel pipe in the vertical direction, and two lateral limit points of the steel pipe in the horizontal direction are connected with the Larsen steel plate piles through lock catches; the stress components in the PS pile are steel pipes and steel materials in a straight line shape, the Larsen steel plate pile is used for preventing the soil arch effect and stopping water, and the Larsen steel plate pile plays a role in assisting stress.
Further, the construction method of the PSLC construction method pile comprises two steps of in-plant processing and field construction, and specifically comprises the following steps:
1) the main purpose of in-plant processing is to ensure material processing quality,
A. the steel pipe and the straight steel are processed and welded in a factory, and the length of the steel pipe and the length of the straight steel can be customized and adjusted according to project conditions;
firstly, in a foundation pit engineering project, a pile mainly bears lateral bending moment, and the bending moment has a smaller value in a certain range of the pile bottom, so that only linear steel can be reserved in the certain range of the pile bottom, and no steel pipe is arranged;
secondly, in the project of foundation pit engineering, for some sections requiring entry into rock, only straight steel is reserved in the range of entry into rock at the bottom of the pile, and no steel pipe is arranged, so that the problem of entry recovery is solved;
B. welding the lock catches to two sides of the steel pipe in a factory, wherein the length of the lock catches is consistent with that of the steel pipe; the finished product finished by the above processing steps is referred to as PS pile for short.
2) The field construction comprises the following steps:
A. measuring and positioning the pay-off;
B. and (4) excavating the guide groove, stirring the soil body by using matched equipment, and pressing the PS piles processed in the factory into the soil layer by using pile sinking equipment.
C. And vertically hoisting the Larsen steel plate pile, aligning the locking notch of the Larsen steel plate pile to the locking groove of the PS pile to enable the Larsen steel plate pile and the PS pile to be mutually buckled into a whole, and then pressing the Larsen steel plate pile into a soil layer through pile sinking equipment.
D. If a plurality of Larsen steel sheet piles are arranged in one group of PSLC construction method piles, the locking notches of the Larsen steel sheet piles are mutually buckled after the rest Larsen steel sheet piles are vertically lifted, and the Larsen steel sheet piles are pressed into the laminated layer through pile forming equipment.
E. And after backfilling the foundation pit, pulling out the PSLC construction method pile by using high-frequency vibration equipment and recycling the pile.
Furthermore, only steel in a straight shape is reserved in the rock entering range of the bottom of the PSLC construction method pile, no steel pipe is arranged, and the rock entering recovery problem is solved by a mode of reducing the contact area of the steel and the surrounding soil body and a construction mode; the specific method comprises the following steps:
performing hole pre-forming by using a rotary drilling rig or a punching rig, wherein the diameter of the formed hole is slightly larger than the diameter of a PSLC construction method pile;
backfilling soil excavated by the rotary drilling rig or the punching rig into the hole after the hole is formed, wherein the backfilled soil in the hole is in a loose state;
binding the grouting pipe on the straight steel, and extending from the top end to the bottom end of the straight steel;
fourthly, pile sinking equipment is used for pressing the PSLC construction method piles into the holes, only straight steel is reserved at the rock entering section, no steel pipe is arranged;
fifthly, injecting cement paste into the hole by using a grouting pipe, and mixing the cement paste with soil to form a cement-soil mixture;
sixthly, excavating the foundation pit, and backfilling the foundation pit after the basement is out of +/-0.00;
seventhly, the PSLC construction method pile is pulled out and recycled by using high-frequency vibration equipment, and the frictional resistance of cement and soil, namely cement soil, in the hole is much smaller than that of cement paste; and the rock entering section at the bottom of the PSLC construction method is a straight steel without a steel pipe, and the contact area between the pile and the cement soil is small, so that the pile is easy to pull out.
Further, when the PS piles are supported by double rows of piles, Larsen steel sheet piles are used for replacing cement mixing piles or high-pressure jet grouting piles for reinforcing the piles among the double rows of piles, and the specific connection method and the steps are as follows:
firstly, constructing front-row PSLC construction method piles through two steps of in-plant processing and on-site construction;
secondly, constructing Larsen steel sheet piles between the front row of piles and the rear row of piles through two steps of in-plant processing and site construction;
thirdly, constructing the back row PSLC construction method pile through two steps of in-plant processing and on-site construction;
fourthly, after the foundation pit is backfilled, the PSLC construction method pile is pulled out and recycled by using high-frequency vibration equipment.
The beneficial effects of the invention are as follows:
1. according to the PSLC construction method pile, the through long straight-line-shaped steel is additionally arranged on the inner side of the steel pipe to improve the bending rigidity of the steel pipe and ensure the engineering safety of a foundation pit; in the aspect of construction, the PSLC construction method pile is constructed into a pile before foundation pit excavation, the pile is pulled out and recovered after the foundation pit is backfilled, and the recovered construction method pile is used as a retaining structure to be repeatedly utilized in the next foundation pit engineering, so that economy and environmental protection are realized; in conclusion, the PSLC construction method pile provided by the scheme can not only meet the safety problem of foundation pit engineering, but also ensure the engineering economy, and can play an important role in the foundation pit engineering;
2. the PSLC construction method pile only keeps the straight steel without arranging the steel pipe, and solves the problem of rock entry recovery by a mode of reducing the contact area of the steel section and the surrounding soil body and corresponding construction measures;
3. according to the PSLC construction method pile, the front row pile and the rear row pile can be connected through Larsen steel sheet piles, the integral rigidity of the double row pile is enhanced, and the integral cost is reduced.
Drawings
FIG. 1 is a schematic plane structure of a PSLC construction method pile of the invention;
FIG. 2 is an enlarged schematic view of the PS pile of the present invention;
FIG. 3 is a schematic diagram of a step of the present invention to solve the problem of rock entry recovery;
FIG. 4 is a schematic diagram of the second step of the present invention to solve the problem of rock entry recovery;
FIG. 5 is a schematic diagram of the third step of the present invention to solve the problem of rock entry recovery;
FIG. 6 is a schematic diagram of the fourth step of the present invention to solve the problem of rock entry recovery;
FIG. 7 is a schematic diagram of the fifth step of the present invention to solve the problem of rock entry recovery;
FIG. 8 is a schematic diagram of six steps of the present invention to solve the problem of rock entry recovery;
fig. 9 is a seven-step schematic diagram of the present invention for solving the problem of rock entry recovery.
In the figure: 1. PS pile, 11, steel pipe, 12, I-shaped steel, 13, lock catch, 2, Larsen steel sheet pile.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1-2, the invention provides a basic structure and a construction method of a pile in a PSLC construction method, the basic structure comprises a PS pile 1, a steel pipe 11, a linear steel 12, a lock catch 13 and a Larsen steel plate pile 2, the basic structure takes a PS pile 1 group as a unit and consists of a plurality of groups of PS piles 1, each group of PS piles 1 comprises a steel pipe 11, a linear steel 12, a plurality of Larsen steel plate piles 2 and a plurality of lock catches 13, when the PS piles 1 are supported by single-row piles, the lock catches 13 are arranged, and when the PS piles 1 are supported by double-row piles, the lock catches 13 are arranged; the PS pile 1 is arranged on the soil facing side, the inner wall of the steel pipe 11 is connected with a linear steel 12 in the vertical direction, and two lateral limit points of the steel pipe 11 in the horizontal direction are connected with the Larsen steel plate pile 2 through lock catches 13; the main stressed components in the PS pile 1 are a steel pipe 11 and a linear steel 12, the Larsen steel plate pile 2 mainly has the functions of preventing the soil arch effect and stopping water, and the Larsen steel plate pile 2 can play an auxiliary stress role.
Example two
A construction method of a PSLC construction method pile comprises two steps of in-plant processing and field construction, and specifically comprises the following steps:
1) the main purpose of in-plant processing is to ensure material processing quality,
A. the steel pipe 11 and the straight steel 12 are processed and welded in a factory, and the length of the steel pipe and the length of the straight steel can be customized and adjusted according to project conditions;
firstly, in a foundation pit engineering project, a pile mainly bears lateral bending moment, and the bending moment has a small value in a certain range of the pile bottom, so that only linear steel 12 can be reserved in the certain range of the pile bottom, and a steel pipe 11 is not arranged;
secondly, in the project of foundation pit engineering, for some sections which require entering the rock, only the linear steel 12 is reserved in the range of entering the rock at the bottom of the pile, and the steel pipe 11 is not arranged, so that the problem of entering the rock and recycling is solved;
B. welding the lock catches 13 on two sides of the steel pipe 11 in a factory, wherein the length of the lock catches 13 is consistent with that of the steel pipe 11; the finished product completed by the above processing steps is referred to as PS pile 1 for short.
2) The field construction comprises the following steps:
A. measuring and positioning the pay-off;
B. and (4) excavating the guide groove, stirring the soil body by using matched equipment, and pressing the PS piles 1 processed in the factory into the soil layer by using pile sinking equipment.
C. The Larsen steel plate pile 2 is vertically lifted, the locking notch of the Larsen steel plate pile 2 is aligned to the locking groove 13 of the PS pile 1, the Larsen steel plate pile 2 and the locking groove are mutually buckled and connected into a whole, and then the Larsen steel plate pile 2 is pressed into a soil layer through pile sinking equipment.
D. If a plurality of Larsen steel sheet piles 2 are arranged in one group of PSLC construction method piles, after the rest Larsen steel sheet piles 2 are vertically lifted, locking notches of the Larsen steel sheet piles 2 are mutually buckled and connected, and the locking notches are pressed into a laminated layer through pile forming equipment.
E. And after the foundation pit is backfilled, pulling out the pile in the PSLC construction method by using high-frequency vibration equipment and recycling the pile.
EXAMPLE III
Referring to fig. 3-9, only the steel bar 12 in the shape of a straight line is reserved in the rock entering range of the bottom of the pile in the PSLC construction method, the steel pipe 11 is not arranged, and the rock entering recovery problem is solved by a mode and a construction mode of reducing the contact area of the steel bar and the surrounding soil body; the specific method comprises the following steps:
performing hole pre-forming by using a rotary drilling rig or a punching rig, wherein the diameter of the formed hole is slightly larger than the diameter of a PSLC construction method pile;
backfilling soil excavated by the rotary drilling rig or the punching rig into the hole after the hole is formed, wherein the backfilled soil in the hole is in a loose state;
binding the grouting pipe on the straight steel, and extending from the top end to the bottom end of the straight steel;
fourthly, pile sinking equipment is used for pressing the PSLC construction method piles into the holes, only straight steel is reserved at the rock entering section, no steel pipe is arranged;
fifthly, injecting cement paste into the hole by using a grouting pipe, and mixing the cement paste with soil to form a cement-soil mixture;
sixthly, excavating the foundation pit, and backfilling the foundation pit after the basement is out of +/-0.00;
seventhly, the PSLC construction method pile is pulled out and recycled by using high-frequency vibration equipment, and the frictional resistance of cement and soil, namely cement soil, in the hole is much smaller than that of cement paste; and the rock entering section at the bottom of the PSLC construction method is a straight steel without a steel pipe, and the contact area between the pile and the cement soil is small, so that the pile is easy to pull out.
Example four
When the PS piles 1 are supported by double rows of piles, the Larsen steel sheet piles 2 are used for replacing cement-soil mixing piles or high-pressure jet grouting piles for reinforcing the piles among the double rows of piles, and the specific connection method and the steps are as follows:
firstly, constructing front-row PSLC construction method piles through two steps of in-plant processing and on-site construction;
secondly, constructing Larsen steel sheet piles between the front row of piles and the rear row of piles through two steps of in-plant processing and site construction;
constructing the back row PSLC construction method pile through two steps of in-plant processing and on-site construction;
fourthly, after the foundation pit is backfilled, the PSLC construction method pile is pulled out and recycled by using high-frequency vibration equipment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a basic structure of PSLC worker method stake, includes PS stake (1), steel pipe (11), a style of calligraphy steel (12), hasp (13), larsen steel sheet pile (2), its characterized in that: the basic structure takes PS piles (1) as a unit and consists of a plurality of groups of PS piles (1), each group of PS piles (1) comprises a steel pipe (11), a linear steel material (12), a plurality of Larsen steel plate piles (2) and a plurality of lock catches (13), when the PS piles (1) are supported by single-row piles, two lock catches (13) are arranged, and when the PS piles (1) are supported by double-row piles, three lock catches (13) are arranged; the PS piles (1) are arranged on the soil-facing side, the inner wall of the steel pipe (11) is connected with a linear steel (12) in the vertical direction, and two lateral limit points of the steel pipe (11) in the horizontal direction are connected with the Larsen steel plate piles (2) through lock catches (13); the stressed components in the PS pile (1) are steel pipes (11) and linear steel (12), the Larsen steel plate pile (2) is used for preventing the soil arch effect and stopping water, and meanwhile, the Larsen steel plate pile (2) plays a role in assisting stress.
2. A construction method of a PSLC construction method pile is characterized by comprising two steps of in-plant processing and field construction, and the concrete steps are as follows:
1) the main purpose of in-plant processing is to ensure material processing quality,
A. the steel pipe (11) and the straight steel (12) are processed and welded in a factory, and the length of the steel pipe and the length of the straight steel can be customized and adjusted according to project conditions;
firstly, in a foundation pit engineering project, a pile mainly bears lateral bending moment, and the bending moment has a small value in a certain range of the pile bottom, so that only linear steel (12) can be reserved in the certain range of the pile bottom, and a steel pipe (11) is not arranged;
secondly, in the project of foundation pit engineering, for some sections which require entering the rock, only the linear steel (12) can be reserved in the range of entering the rock at the bottom of the pile, and no steel pipe (11) is arranged, so that the problem of recycling entering the rock is solved;
B. welding the lock catches (13) on two sides of the steel pipe (11) in a factory, wherein the length of the lock catches (13) is consistent with that of the steel pipe (11); the finished product finished through the above processing steps is referred to as PS pile (1).
2) The field construction comprises the following steps:
A. measuring and positioning the pay-off;
B. and (2) excavating the guide groove, stirring the soil body by using matched equipment, and pressing the PS piles (1) processed in the factory into the soil layer by using pile sinking equipment.
C. The Larsen steel plate pile (2) is vertically lifted, the locking notch of the Larsen steel plate pile (2) is aligned to the locking groove (13) of the PS pile (1) to be mutually buckled and connected into a whole, and then the Larsen steel plate pile (2) is pressed into a soil layer through pile sinking equipment.
D. If a plurality of Larsen steel sheet piles (2) are arranged in one group of PSLC construction method piles, the residual Larsen steel sheet piles (2) are vertically lifted, locking notches of the Larsen steel sheet piles (2) are mutually buckled and connected, and the locking notches are pressed into a laminated layer through pile forming equipment.
E. And after backfilling the foundation pit, pulling out the PSLC construction method pile by using high-frequency vibration equipment and recycling the pile.
3. The construction method of a PSLC construction method pile according to claim 2, wherein: only the steel (12) in the shape of a straight line is reserved in the rock entering range of the bottom of the PSLC construction method pile, the steel pipe (11) is not arranged, and the rock entering recovery problem is solved by a mode and a construction mode of reducing the contact area of the steel and the surrounding soil body; the specific method comprises the following steps:
performing hole pre-forming by using a rotary drilling rig or a punching rig, wherein the diameter of the formed hole is slightly larger than the diameter of a PSLC construction method pile;
backfilling soil excavated by the rotary drilling rig or the punching rig into the hole after the hole is formed, wherein the backfilled soil in the hole is in a loose state;
binding the grouting pipe on the straight steel, and extending from the top end to the bottom end of the straight steel;
fourthly, pile sinking equipment is used for pressing the PSLC construction method piles into the holes, only straight steel materials are reserved at the rock entering section, steel pipes are not arranged;
using a grouting pipe to inject cement slurry into the hole, and mixing the cement slurry with soil to form a cement-soil mixture;
sixthly, excavating the foundation pit, and backfilling the foundation pit after the basement is out of +/-0.00;
seventhly, the PSLC construction method pile is pulled out and recycled by using high-frequency vibration equipment, and the frictional resistance of cement and soil, namely cement soil, in the hole is much smaller than that of cement paste; and the rock entering section at the bottom of the PSLC construction method is a straight steel without a steel pipe, and the contact area between the pile and the cement soil is small, so that the pile is easy to pull out.
4. The construction method of a PSLC construction method pile according to claim 2, wherein: when the PS piles (1) are supported by double rows of piles, Larsen steel sheet piles (2) are used for replacing cement mixing piles or high-pressure jet grouting piles for reinforcing the piles among the double rows of piles, and the specific connection method and the steps are as follows:
firstly, constructing front-row PSLC construction method piles through two steps of in-plant processing and on-site construction;
secondly, constructing Larsen steel sheet piles between the front row of piles and the rear row of piles through two steps of in-plant processing and site construction;
constructing the back row PSLC construction method pile through two steps of in-plant processing and on-site construction;
fourthly, after the foundation pit is backfilled, the PSLC construction method pile is pulled out and recycled by using high-frequency vibration equipment.
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Citations (16)
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